High Quality Content by WIKIPEDIA articles! Andrew Delmar Hopkins (August 20, 1857 – 1948) was an American entomologist in the late 19th and early 20th centuries, becoming head entomologist for the U.S. Department of Agriculture in 1904. His research was primarily on bark beetle population dynamics and impacts, and he also developed the Law of Bioclimatics. Hopkins’s research is the cornerstone of entomology in North America. Hence, he is referred as the “Father of North American entomology.”